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Surface Expression Using the AIDA Autotransporter: Towards Live Vaccines and Whole-Cell Biocatalysis

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Surface Expression Using the AIDA Autotransporter: Towards Live Vaccines and Whole-Cell Biocatalysis Surface expression using the AIDA autotransporter: Towards live vaccines and whole-cell biocatalysis Martin Gustavsson M. Sc. Royal Institute of Technology Stockholm 2011 ©Martin Gustavsson 2011 School of Biotechnology Royal Institute of Technology (KTH) AlbaNova University Center Stockholm Sweden ISBN 978-91-7501-182-0 ISSN 1654-2312 TRITA-BIO Report 2011:25 Martin Gustavsson (2011): Surface expression using the AIDA auto-transporter: Towards live vaccines and whole-cell biocatalysis. School of Biotechnology, Royal Institute of Technology (KTH), AlbaNova University Center, Stockholm, Sweden. Abstract The area of surface expression has gathered a lot of interest from research groups all over the world and much work is performed in the area. Autotransporters have been used for surface expression in Gram-negative bacteria. One of the more commonly used autotransporters is the Adhesin Involved in Diffuse Adherence (AIDA) of pathogenic Escherichia coli. The surface expression of enzymes and vaccine epitopes offer several advantages. Surface expressed enzymes gain similar properties to immobilised enzymes, mainly simplified handling and separation using centrifugation. Surface expressed vaccine epitopes can have longer half-lives inside the animal that is to be immunized and surface groups on the host cell can act as adjuvants, increasing the immune response and leading to a better immunisation. However, while much basic research is directed towards mechanisms of surface expression using autotransporters there are few reports regarding production of surface expressed protein. Thus the aim of this work was the optimisation of the yield and productivity of surface expressed protein. Protein Z, an IgG-binding domain of Staphylococcal protein A, was used as a model protein for the investigation of which cultivation parameters influenced surface expression. The choice of cultivation medium gave the largest impact on expression, which was attributed to effects based on the induction of the native promoter of AIDA. The AIDA system was then used for the expression of two Salmonella surface proteins, SefA and H:gm, with potential for use as vaccine epitopes. SefA was verified located on the cell surface, and H:gm was found in the outer membrane of the host cell, though only in proteolytically truncated forms lacking the His6-tag used for detection. This proteolysis persisted in E. coli strains deficient for the outer membrane protease OmpT and was concluded to be dependent on other proteases. The removal of proteolysis and further optimisation of the yield of surface-expressed protein are important goals of further work. Keywords: AIDA-autotransporter, Escherichia coli, live vaccines, surface expression List of publications This thesis is based on the following publications, which are referred to by their roman numerals: I. Nhan N, Gonzalez de Valdivia E, Gustavsson M, Hai T, Larsson G (2011). Surface display of Salmonella epitopes in Escherichia coli and Staphylococcus carnosus. Microbial Cell Factories 10:22 II. Gustavsson M, Bäcklund E, Larsson G (2011). Optimisation of surface expression using the AIDA autotransporter. Microbial Cell Factories 10:72 Table of contents 1 Introduction 7 2 Surface expression 3 2.1 Applications for surface expression 3 2.2 Bacterial surface expression 6 3 Autotransport 10 3.1 Autotransporter passenger proteins 11 3.2 Secretion mechanism of autotransporters 12 3.3 The autotransporter Adhesin Involved in Diffuse Adherence (AIDA) 18 4 Present investigation 21 4.1 Strategy and model system 21 4.2 Optimisation of surface expression (II) 24 4.3 Surface expression of Salmonella epitopes 32 4.4 Effects of proteolysis on surface expression (I, II) 34 5 Concluding remarks 38 6 Abbreviations 39 7 Acknowledgements 40 8 References 41 1 Introduction Recombinant protein production is today a large, multibillion industry. The proteins produced can be divided into industrial enzymes, with a revenue of approximately 3.3 billion dollars in 2010 [1], and therapeutic proteins reaching a revenue of 93 billions in 2010 [2]. This was all made possible by a discovery of Smith and co-workers in 1970. They discovered the DNA-modifying type II restriction enzymes, which led to big advances in the area of biotechnology [3]. Restriction enzymes provided the tool needed for manipulation of DNA and enabled the construction of recombinant DNA. Recombinant DNA technology has enabled the cloning and production of proteins of interest using well-studied production organisms, such as the Escherichia coli, Saccharomyces cerevisiae, Bacillus and Aspergillus. Industrial enzymes can be broadly divided into food enzymes, enzymes used in the textile industry, enzymes for wood, pulp and paper processing and washing powder enzymes. An example of a large-scale enzymatic processes is the production of high-fructose syrup [4]. The use of enzymes for biocatalysis of the synthesis of fine chemicals is an important industrial area [5]. Enzymes bring many advantages compared to conventional, chemical catalysts, such as high catalytic efficiency and high enantiomeric selectivity. Furthermore, the use of organic solvents can often be avoided in favour of water, leading to more environmentally friendly processes. However, enzyme catalysis has its disadvantages, one being the cost of the enzyme production and purification. Another obstacle is that it is generally not possible to separate the enzyme from the product for reusing. This can be circumvented through the immobilisation of the enzyme on a solid support. However, this adds more steps to the production process and increases the cost. Another option is the use of whole cells, often yeast or bacteria, as biocatalysts. This removes the purification and immobilisation of the enzyme and enables easy separation of the catalyst from the reaction medium through for instance centrifugation. However, this adds a mass transfer barrier between the reactants in the reaction medium and the enzymes inside the cells. Therapeutic recombinant proteins include for instance insulin [6] and recombinant factor VIII [7]. Vaccines are another large market, which is shifting from the use of traditional, attenuated pathogens towards the use of recombinant subunit vaccines. The use of subunit vaccines is advantageous compared to the use of attenuated bacteria or viruses, since the risk of the attenuated vaccine reverting to virulent forms is removed [8]. However, the half-life of a subunit vaccine inside animals and humans is low, leading to a weak immune response and inefficient immunisation. Surface expression technology may be used to circumvent these problems. Surface expression is the process of producing a protein anchored to the surface of cells, for instance bacteria or yeast, or bacteriophages. By tethering the subunit vaccine to the surface of a non-pathogenic cell or virus particle it is readily accessible for recognition by the host immune system. Additionally, the surface of the cell or virus used as a host for surface expression can act as an adjuvant for the vaccine, thereby increasing the strength of the immunogenic response [8][9]. Finally, if the cell used for surface expression is a part of the natural flora of the host it is possible for it to colonize the host and persist for a longer time, further increasing the immune response to the presented subunit vaccine. Surface expressed enzymes could bring the ease of separation of immobilized enzymes and whole-cell biocatalysts while avoiding some of the disadvantages. The enzyme is produced and ready for use with minimal downstream operations compared to conventional immobilisation techniques, while avoiding the diffusion barrier associated with whole cell catalysts with intracellular expression [10]. Much work has been put into the area of surface expression of both enzymes and vaccines. However, for the realisation of large-scale use of surface expression technology there are some requirements that have to be met. The system used for achieving surface expression must be flexible with respect to the structure and size of proteins that can be expressed, in order to enable the use in different applications. Furthermore, it must be possible to express large amounts of protein on the surface on the chosen host cell, and this high level of expression must be possible to maintain at high cell densities in order to achieve economical processes. While much work has been reported regarding surface expression there are few studies on the production aspect. 2 The aim of this work was to address these problems using autotransport [11] to achieve surface expression, and to optimise the yield of surface expressed protein as well as the productivity of surface expressing cells. Autotransporters have successfully been introduced into non-pathogenic laboratory strains lacking the export systems of pathogenic strains, and has since gathered much interest for use in recombinant surface expression. This is due to autotransporters having been found to readily work for the expression of large proteins and to high protein concentrations (105 copies per cell) [12]. E. coli has been employed frequently due to being a good expression host since it is well studied and grows readily with a high rate on cheap, defined media. Furthermore, as laboratory E. coli export few proteins due to the mentioned lack of export systems associated with virulence, leading to recombinant proteins expressed on the surface being relatively pure. 2 Surface expression Smith and co-workers were the first to
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